<template>
    <div class="search-form">

        <!-- 头部tab切换 -->
        <el-row type="flex" class="search-tab">
            <span v-for="(item, index) in tabs" :key="index"
            @click="handleSearchTab(item, index)"
            :class="{active: index === currentTab}">
                <i :class="item.icon"></i>{{item.name}}
            </span>
        </el-row>

        <el-form class="search-form-content" ref="form" label-width="80px">
            <el-form-item label="出发城市">
                <!-- fetch-suggestions 返回输入建议的方法 -->
                <!-- select 点击选中建议项时触发 -->
                <el-autocomplete
                v-model="departCity"
                :fetch-suggestions="queryDepartSearch"
                placeholder="请搜索出发城市"
                @select="handleDepartSelect"
                class="el-autocomplete"
                ></el-autocomplete>
            </el-form-item>
            <el-form-item label="到达城市">
                <el-autocomplete
                v-model="destCity"
                :fetch-suggestions="queryDestSearch"
                placeholder="请搜索到达城市"
                @select="handleDestSelect"
                class="el-autocomplete"
                ></el-autocomplete>
            </el-form-item>
            <el-form-item label="出发时间">
                <!-- change 用户确认选择日期时触发 -->
                <el-date-picker type="date" v-model="departDate"
                value-format="yyyy-MM-dd"
                placeholder="请选择日期" 
                style="width: 100%;"
                @change="handleDate">
                </el-date-picker>
            </el-form-item>
            <el-form-item label="">
                <el-button style="width:100%;" 
                type="primary" 
                icon="el-icon-search"
                @click="handleSubmit">
                    搜索
                </el-button>
            </el-form-item>
            <div class="reverse">
                <span @click="handleReverse">换</span>
            </div>
        </el-form>  
      </div>
</template>

<script>
export default {
    data(){
        return {
            tabs: [
                {icon: "iconfont icondancheng", name: "单程"},
                {icon: "iconfont iconshuangxiang", name: "往返"}
            ],
            currentTab: 0,
            departCity:'',
            departCode:'',
            destCity: '',
            destCode: '',
            departDate: '',
        }
    },
    methods: {
        // tab切换时触发
        handleSearchTab(item, index){
          console.log(item, index)
          if(item.name == "往返"){
            this.$alert('目前不支持往返,请使用单程选票','提示',{
              type: 'warning',
              confirmButtonText: '确定'
            })
          }  
        },
        
        // 出发城市输入框获得焦点时触发
        // value 是选中的值，cb是回调函数，接收要展示的列表
        queryDepartSearch(value, cb){
          if(value == ""){
            return cb([])
          }
          this.$axios({
            url: '/airs/city',
            params: {
              name: value
            }
          }).then(res=>{
            console.log(99,res)
            let arr = res.data.data
            arr.forEach(item=>{
              item.value = item.name.replace('市','')
            })
            cb(arr)
          })
            //  cb([
            //      {value: 1},
            //     {value: 2},
            //      {value: 3},
            // ]);
        },

        // 目标城市输入框获得焦点时触发
        // value 是选中的值，cb是回调函数，接收要展示的列表
        queryDestSearch(value, cb){
         this.queryDepartSearch(value, cb)
            // cb([
            //     {value: 1},
            //     {value: 2},
            //     {value: 3},
            // ]);
        },
       
        // 出发城市下拉选择时触发
        handleDepartSelect(item) {
          this.departCode = item.sort
            
        },

        // 目标城市下拉选择时触发
        handleDestSelect(item) {
            this.destCode =item.sort
        },

        // 确认选择日期时触发
        handleDate(value){
           
        },

        // 出发和目标城市切换时触发
        handleReverse(){
            let start = this.departCity
            let startCode = this.departCode
            this.departCity = this.destCity
            this.departCode = this.destCode
            this.destCity = start
            this.destCode = startCode
        },

        // 提交表单是触发
        handleSubmit() {
   //校验
   if(this.departCode == ""){
    return this.$message({
     message: '请选择出发城市',
     type: 'warning'
    })
   }
   if (this.destCode == ""){
    return this.$message({
     message: '请选择到达城市',
     type: 'warning'
    })
   }
   if(this.departDate==""){
    return this.$message({
     message: '请选择出发日期',
     type: 'warning'
    })
   }
   //跳转到机票列表页面
   this.$router.push({
    path: '/air/flights',
    //跳转页面并传递参数
    query: {
     departCity: this.departCity,
     departCode:this.departCode,
     destCity:this.destCity,
     destCode:this.destCode,
     departDate:this.departDate
    }
   })
  },
    },
    mounted() {
       
    }
}
</script>

<style scoped lang="less">
.search-form{
    border:1px #ddd solid;
    border-top:none;
    width:360px;
    height:350px;
    box-sizing: border-box;
}

.search-tab{
  span{
    display: block;
    flex:1;
    text-align: center;
    height:48px;
    line-height: 42px;
    box-sizing: border-box;
    border-top:3px #eee solid;
    background:#eee;
  }

  .active{
    border-top-color: orange;
    background:#fff;
  }

  i{
    margin-right:5px;
    font-size: 18px;

    &:first-child{
      font-size:16px;
    }
  }
}

.search-form-content{
  padding:15px 50px 15px 15px;
  position: relative;

  .el-autocomplete{
    width: 100%;
  }
}

.reverse{
  position:absolute;
  top: 35px;
  right:15px;

  &:after,&:before{
      display: block;
      content: "";
      position: absolute;
      left:-35px;
      width:25px;
      height:1px;
      background:#ccc;
  }

  &:after{
      top:0;
    }

    &:before{
      top:60px;
    }

  span{
    display: block;
    position:absolute;
    top: 20px;
    right:0;
    font-size:12px;
    background: #999;
    color:#fff;
    width:20px;
    height:20px;
    line-height: 18px;
    text-align: center;
    border-radius: 2px;
    cursor: pointer;

    &:after,&:before{
      display: block;
      content: "";
      position: absolute;
      left:10px;
      width:1px;
      height:20px;
      background:#ccc;
    }

    &:after{
      top:-20px;
    }

    &:before{
      top:20px;
    }
  }
}
</style>